88 JOURNAL OF ECONOMIC ENTOMOLOGY [\^ol. 9 



I 



Limited application of the two mixtures of arsenate of lead and 

 sulphur made on May 18, when the strawberries were in full bloom, 

 did not apparently injure the open blossoms. 



It thus appears that the powdered arsenate of lead and sulphur 

 give the best protection — in fact, almost perfect protection. The 

 plots treated with the arsenate of lead and sulphur when in full bloom 

 w^ere almost as white as snow while the untreated plots were green 

 with here and there an occasional blossom. 



The second treatments were appHed when much bloom was out but 

 none of the substances used the second time seemed to blast the blos- 

 soms. 



Later in the season, a stud}' of the cost of treating with a mixture of 

 powdered arsenate of lead and sulphur Avas undertaken. 



A plot 10 rds. long by 2 rds. wide was selected, containing 8 two-feet- 

 wide rows of strawberries running lengthwise. Care was taken to 

 coat the plots to about the same extent as had proven successful in 

 the experiments and the half and half sulphur-lead mixture was used. 



Nine and three quarters lbs. of material were used in covering this 

 plot and 6.56 minutes were required to go over the area. At this rate 

 the amount of material per acre is 78 lbs. and the amount of time is 52 

 minutes and 28 seconds. On the basis of 10 cts. a lb., which is probably 

 the lowest figure the half and half mixture could be had for, the cost 

 of material for the two treatments that have proven necessary w'ould 

 be S15.60 an acre. On the basis of the 1 to 5 mixture the cost would 

 be about $7.30. For the sake of easy figuring let us assume that the 

 time required for each application is one hour. The cost of labor 

 would not exceed 40 cts. an acre. 



Thus we see that the total cost for materials and labor ranges from 

 $7.70 to $16.00 an acre. Li view of the fact that, owing to heavier 

 foliage, the amount of material used was greater than that necessary 

 in the spring and the additional fact that practice w^ould enable the 

 operator to cover his territory more rapidly, it is probable that the 

 actual cost of the application will prove much less than the figures 

 given would lead one to expect. 



President Glenn W. Herrick: Is there any discussion of this 

 paper on the strawberry weevil? 



Mr. William Moore: I was rather interested in Dr. Headlee's 

 paper. We have. been working on the strawberry weevil in Minne- 

 sota, but have obtained some opposite results. I was speaking to 

 Dr. Headlee about this and he states that in New Jersey the weevil 

 hibernates in woods. In INIinnesota we get the weevil coming back to 



